summaryrefslogtreecommitdiff
path: root/include/linux/hugetlb.h
diff options
context:
space:
mode:
authorDavid Woods <dwoods@ezchip.com>2015-12-17 22:31:26 +0300
committerWill Deacon <will.deacon@arm.com>2015-12-21 20:26:00 +0300
commit66b3923a1a0f77a563b43f43f6ad091354abbfe9 (patch)
treeb380eb7da866452ff697dfb588309184b86f1ef1 /include/linux/hugetlb.h
parent0a28714c53fd4f7aea709be7577dfbe0095c8c3e (diff)
downloadlinux-66b3923a1a0f77a563b43f43f6ad091354abbfe9.tar.xz
arm64: hugetlb: add support for PTE contiguous bit
The arm64 MMU supports a Contiguous bit which is a hint that the TTE is one of a set of contiguous entries which can be cached in a single TLB entry. Supporting this bit adds new intermediate huge page sizes. The set of huge page sizes available depends on the base page size. Without using contiguous pages the huge page sizes are as follows. 4KB: 2MB 1GB 64KB: 512MB With a 4KB granule, the contiguous bit groups together sets of 16 pages and with a 64KB granule it groups sets of 32 pages. This enables two new huge page sizes in each case, so that the full set of available sizes is as follows. 4KB: 64KB 2MB 32MB 1GB 64KB: 2MB 512MB 16GB If a 16KB granule is used then the contiguous bit groups 128 pages at the PTE level and 32 pages at the PMD level. If the base page size is set to 64KB then 2MB pages are enabled by default. It is possible in the future to make 2MB the default huge page size for both 4KB and 64KB granules. Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Reviewed-by: Steve Capper <steve.capper@linaro.org> Signed-off-by: David Woods <dwoods@ezchip.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/linux/hugetlb.h')
-rw-r--r--include/linux/hugetlb.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 685c262e0be8..b0eb06423d5e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -96,9 +96,7 @@ u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
struct address_space *mapping,
pgoff_t idx, unsigned long address);
-#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
-#endif
extern int hugepages_treat_as_movable;
extern int sysctl_hugetlb_shm_group;